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(1)
(a-b).(ka+b)=-21
(1,-2).(3k+2, k+3)=-21
3k+2 -2(k+3) =-21
k-4=-21
k=-17
(2)
a=(3,1),b=(2,3),c=(x,y)
(a+c)//b
(1+y)/(3+x) = 3/2
2(1+y)=3(3+x)
3x-2y=-7 (1)
(b+c).a =0
(2+x, 3+y).(3,1)=0
3(2+x) + 3+y=0
3x+y= -9 (2)
(2)-(1)
3y=-2
y=-2/3
from (1)
3x-2y=7
3x+ 4/3 =7
3x = 17/3
x= 17/9
C(17/9, -2/3)
(a-b).(ka+b)=-21
(1,-2).(3k+2, k+3)=-21
3k+2 -2(k+3) =-21
k-4=-21
k=-17
(2)
a=(3,1),b=(2,3),c=(x,y)
(a+c)//b
(1+y)/(3+x) = 3/2
2(1+y)=3(3+x)
3x-2y=-7 (1)
(b+c).a =0
(2+x, 3+y).(3,1)=0
3(2+x) + 3+y=0
3x+y= -9 (2)
(2)-(1)
3y=-2
y=-2/3
from (1)
3x-2y=7
3x+ 4/3 =7
3x = 17/3
x= 17/9
C(17/9, -2/3)
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